Status of the Large Hadron Collider (LHC)

The European Physical Journal C - The Large Hadron Collider (LHC), due to be commissioned in 2007, will provide particle physics with the first laboratory tool to access the energy frontier above 1...     

Heavy-Ion Physics with the Compact Muon Solenoid (CMS) Detector at the Large Hadron Collider (LHC)

Physics of Atomic Nuclei - The present article gives a brief account of some interesting results obtained most recently in studying heavy-ion physics—in particular, quark–gluon...     

Interaction of heavy ions at the Large Hadron Collider (LHC)

The present-day understanding of the problem of the deconfinement of nuclear matter as applied to experiments that would study heavy ion collisions at the Large Hadron Collider (LHC) is discussed briefly. The elliptic energy flow, jet quenching, and the production of J/Ψ and Y quarkonia are appropriate observables here.     

Searches for New Physics in the Dilepton Channel with the CMS Detector at the Large Hadron Collider

Physics of Atomic Nuclei - Results of searches for signals from new physics beyond the Standard Model in proton–proton collisions at the c.m. energy of $$\sqrt{s}=13$$ TeV are surveyed....     

Results of searches for extra spatial dimensions in the CMS experiment at the LHC

An overview of basic results of the CMS experiment that concern searches for signals from extra spatial dimensions in the course of the first run of the Large Hadron Collider (LHC) at the c.m. proton–proton collision energies of 00000 and 8 TeV is given.     

Program of Searches with the CMS Detector for Signals from Multidimensional Low-Energy Gravity at the Large Hadron Collider

Physics of Atomic Nuclei - This article, presented on behalf of the Compact Muon Solenoid (CMS) Collaboration, gives a generalizing survey of the results of the CMS experiment that concern searches...     

Dijet physics with CMS detector at the Large Hadron Collider

The results from various dijet distributions in proton?Cproton collisions at a centre-of-mass energy of 7 TeV, with 2010 and 2011 data from the CMS experiment, are presented. The measurements of the dijet mass spectra, centrality ratio, azimuthal decorrelation and angular distribution are shown. Sensitivity of the phenomenological parameters used to model different event generators is also investigated. Prospects for observing evidence for new physics in these distributions are presented.     

Prospects for identification the direct and indirect effects of extra spatial dimensions at the Large Hadron Collider

The existence of massive graviton states, that may be produced as real and virtual particles in high-energy proton collisions, is predicted by the modern developments of Kaluza–Klein models with extra spatial dimensions. The direct and indirect signatures of large and warped extra spatial dimensions may be revealed by analyzing the specific characteristics of dilepton and diphoton final states formed in proton–proton collisions at the Large Hadron Collider (LHC). Virtual effects in the Kaluza–Klein models with large extra spatial dimensions can be discovered by the specic behavior of the dilpton and diphoton invariant-mass distributions, and their identication (in case of discovery) can be performed by the analysis of their angular distributions with integrated center-edge asymmetry. Assuming the nominal values of the LHC collision energy (14 TeV) and luminosity (100 fb^–1), for the models with large extra spatial dimensions we find that the sensitivity to the cutoff parameter M _S will extend up to 8.5 and 7.6 TeV for their discovery and identification, respectively. For the Randall–Sundrum model with a warped extra dimension, the LHC experiments will be sensitive to the graviton resonance with mass up to 4.4 and 3.1 TeV for its discovery and identification, respectively.     

Optimization of the analysis of single top-quark production at the Large Hadron Collider (LHC)

Several steps of an investigation of single top-quark production at the Large Hadron Collider (LHC) are discussed. A number of general problems associated with basic steps of this analysis are discussed. The investigations are performed for the CMS (Compact Muon Solenoid detector) Collaboration, and detailed results will be presented in CMS publications. Three event generators used by the CMS Collaboration in simulating single top-quark production (SingleTop, MC@NLO, and a generator based on the MadGraph package) are compared in the present study. Schemes for optimizing the observation of a single top quark on the basis of the neural-network method are presented. The first steps in searches for possible anomalous vector couplings in the Wtb vertex that manifest themselves in processes of single top-quark production are described.     

Oxidation and contact resistance of Sn-Ag coated superconducting strands for the Large Hadron Collider (LHC)

The oxides formed on the Sn-Ag coated Large Hadron Collider (LHC) superconducting cables during a 200 °C heat treatment in air are described and the oxide composition is compared with the interstrand contact resistance (R_C). The analysis of more than 250 interstrand contact areas shows that the higher the average Cu content with respect to the Sn content in the oxide, the higher is R_C. During the 200 °C heat treatment, Sn in the coating is transformed into a Cu₃Sn layer, on which an oxide grows that consists essentially of a thin outermost layer of CuO on top of Cu₂O, similar to the oxide structure formed on bare Cu. The underlying Cu₃Sn layer acts as an O diffusion barrier that prevents O diffusion into the Cu bulk during the subsequent cable heat treatment under high pressure. On contact zones where the Cu₃Sn layer is not formed during the 200 °C heat treatment mainly Sn oxide grows and R_C is comparatively low.     

在大型强子对撞机上的CMS实验

LHC(large hadron collider)是目前世界上能量最高的强子对撞机.CMS(compact muon solenoid,中文译名是紧凑型缪子螺线管探测器)是LHC上的主要实验计划之一,其目标就是要寻找Higgs粒子或者超出标准模型的其他新粒子,探清自然界的电弱破缺机制,以及寻找暗物质.CMS实验位于高能量和高亮度的最前沿,是21世纪初人类认识微观世界最重要的物理实验之一.中国参加了这项国际合作,制作了部分μ子探测器、磁铁支架、电子学和地板等,目前转入物理研究工作,争取在物理研究中作出有显示度的贡献.文章简要介绍了CMS探测器以及CMS实验的目标和意义.     

在大型强子对撞机上的CMS实验

LHC（large hadron collider）是目前世界上能量最高的强子对撞机.CMS(compact muon solenoid,中文译名是紧凑型缪子螺线管探测器)是LHC上的主要实验计划之一,其目标就是要寻找Higgs粒子或者超出标准模型的其他新粒子,探清自然界的电弱破缺机制,以及寻找暗物质.CMS实验位于高能量和高亮度的最前沿,是21世纪初人类认识微观世界最重要的物理实验之一.中国参加了这项国际合作,制作了部分μ子探测器、磁铁支架、电子学和地板等,目前转入物理研究工作,争取在物理研究中作出有显示度的贡献.文章简要介绍了CMS探测器以及CMS实验的目标和意义.     

Search for new physics at Large Hadron Collider

We review the search for new physics to be done at Large Hadron Collider,—search for Higgs boson, supersymmetry, and exotic.     

Energy calibration of Hadron jets in the CMS (LHC) experiment with use of two-top-quark channel

Procedure of establishing the jet energy scale by means of events with top-quarks, including the process of W-boson decay into two light quarks (u, d, s, c) is described. Calibration relations are derived from comparing the invariant mass of two jets from W-boson decay with the known mass of W-boson. Calibration coefficients are determined for the two types of jets (CaloJet and ZSPJet) and estimations of systematic errors of these coefficients are given.     

Prospects for Higgs boson searches at the Large Hadron Collider

These proceedings summarize the sensitivity for the CMS and ATLAS experiments at the LHC to discover a Standard Model Higgs boson with relatively low integrated luminosity per experiment. The most relevant discovery modes are dealt with. A brief discussion on the expected performance from these experiments in searches for one or more of the Higgs bosons from the minimal version of the supersymmetric theories is also included.